'The
flood is come! Oh God save us all; the day of judgement is come!'

Turkey, 2003: Bernice and Jason join two rival expeditions
attempting to find Noah's Ark. While one team follows the Bible and its own
beliefs, the other relies on a more exact science - but both paths lead to the
same revelation. And, as the region moves ever closer to war, they uncover the
key to a timeless mystery and a terrible secret.

The Doctor
and Chris are called in to a situation fast getting out of control, as
countless numbers flee a biological terror. The world is about to undergo a new
genesis. While Chris gets himself a job with NASA, The Doctor must unravel the
ties between Mount Ararat, the moon, and an ancient exodus.

Mankind
faces apocalypse. But can the aid of a far older race, alongside companions
past and present, prevent the planet being twisted into the image of a
long-dead world?